Just for the fun of it, I'm going to post GX1_MAN's signature block comments. I get the impression you did not read it.
"Please post as much information about your computer, operating system, and problem as possible, what happened prior to problems, etc. Too much info is OK, too little is pointless! Don't just say "My computer doesn't work. What's wrong?" We shouldn't have to drag the details out of you. It is YOUR problem, not ours."
And, some specific questions to the ball rolling: Is your computer a desktop or laptop? What mouse are you using? Did it previously work OK? If you have a laptop, are you using the touchpad or an external mouse?